William Theisen

EcoAct North America




A graduate from Boston University with an MBA from HEC Paris, William began working in climate finance with the Gold Standard Foundation, a certification body headquartered in Geneva that evaluates carbon reduction and sustainable impacts using results-based methodologies. Following this role, he worked with NGOs Nexus for Development (Nexus) and the Group for the Environment, Renewable Energy and Solidarity (GERES) to scale-up more than a dozen carbon reduction projects in Asia and Africa by leveraging innovative market mechanisms such as carbon finance and crowd funding. As a Director at Nexus, William established partnerships to support these projects with numerous companies worldwide. William also performed in field research in collaboration with Yale University while based in Mali focused on the evaluating the risks and opportunities in the value chain for carbon finance and clean cookstove programs in West Africa.

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